CA1165662A

CA1165662A - Die forged body for a shutoff or non-return valve

Info

Publication number: CA1165662A
Application number: CA000348861A
Authority: CA
Inventors: Karl-Heinz Hulsermann; Gunter Hoppe
Original assignee: Deutsche Babcock AG
Current assignee: Deutsche Babcock AG
Priority date: 1979-04-24
Filing date: 1980-03-31
Publication date: 1984-04-17
Also published as: HU179690B; EP0017663B1; DE2916430A1; ES8103327A1; DE2967354D1; CS215037B2; EP0017663A1; DE2916430C2; ES490768A0

Abstract

ABSTRACT

A die forged body for a shutoff or non-return valve with two fullbore passages which are connectable to piping, the end cross sections of the parts having passages being situated in the axis of the piping, and the passages being separated by a valve disc movable perpendicularly to the longitudinal axis of the valve, the improvement being that the center line of at least one of the passages is curved so as to be aligned with the axis of the piping, and the method of manufacturing a valve body including providing a blank having at least one part angled to the longitudinal axis of the valve and including a passage therein, bending the angled cylindrical part with a calibrated forging roll to be aligned with the longitudinal axis of the valve, and finish forging the blank in a calibrated die.

Description

1 ~6566~

This invention relates to a die forged body as well as to a process for manufacturing such a body, which is used for a shutoff or a non-return valve and which is provided with two unimpeded flow passages which are connected into piping by welding. The junctures of the passages in the valve are separ-ated from each other, when required, by a valve disc which is movable in a plane transverse to the longitudinal a~is of the valve.
In known valves of this type, the center ]ines of the passages are arranged obliquely to the axis of the piping into which the passages are to be connected, and these valves are die forged both for cost reasons and for achieving a suitable finished product. When the valves are welded into the piping, the ~eld must meet exacting safety requirements, and it is normal ~o test the weld ultrasonically or radiographically~ It is almost impossible to mount the test heads of the testing equipment on valves which have oblique passages therein.
The obje~t of this invention is therefore to create a valve body which is easy to manufacture, offers a reduced resistance to flow of liquid passing therethrough, and has cylin-drical end portions which are easy to weld into plping, and produce a finished weld which can easily be tested ultxasonically or radiographically.
The valve body of this invention achieves the above object by having at least one of the passages in the body being curved so as to align with the axis o~ the pipe into which the body is to be welded. Preferably only one passage is curved in this manner~ while the center line of the other passage i5 straight .. . . . .. . .... _ . . .. . , _ .

~ ~65~2 and joins the valve bore at or near its base~ Both passages are aligned on the same axis. Such a valve can be manufactured by forging a blank in a die -to form at least one passage at an angle to the longitudinal axis of the valve, and then bending the angled cylindrical part including the passage with the aid of a calibrated forging roll and a calibrated die.
As noted, this type of valve can be manufactured so that the parts through which the passages e~it from the valve are cylindrical which aids in the welding of the valve into a -pipe, so that the passages are aligned with the pipe, and testing of the welds between the cylindrical parts and the pipe can relatively easily be accomplished. The form of the passages also reduces the resistance to flow of liquid through the valve.
An embodiment of the invention is now described with reference to the attached drawings, in which:
Figure 1 is a part section view of a forging blank for manufacturing a valve body according to this invention, and Figure 2 is a longitudinal cross section through part of the valve body according to this invention.
The valve represented in Figure 2 is a shutoff valve, however, it should be noted that such a valve body may also be applied to non-return valves.
Body 1 of the shutoff valve is provided with two cylindrical parts 2 and 3, each having a passage 4 and 5 respec-tively therethrough. The passages 4 and 5 terminate in a valve bore 6 extending transversely to the passages 4 and 5. ~ valve stem 7 is shown in the valve bore 6 so as to~be longitudinally movable in the valve bore, and such valve stem is sealed by a gland 8. At its lower end, the valve stem 7 is provided with a valve disc 9 which cooperates with a valve seat 10.
The two cylindrical parts 2 and 3 have end portions which can be welded into pipi~g 11. For testing the weld between the parts 2 and 3, and the piping 11, an ultrasonic or radio-graphic test head will be passed over the welds and can easily be accomplished with this shape o~ valv~ body, The passage 4 a.rranged on the valve inlet side is in a longitudinal direction in the axis of piping 11, whereas the center line of the passage 5 is curved and enters the valve bore 6 at a place spaced from the entry of passage 4 into valve bore 6.
The valve body itself is simply manufactured by forging a blank 12, as shown.in Figure 1. Note that the blank 12 is provided with a passage in a cylindrical extending part 3'.
When forging with a calibrated roll, the cylindrical part 3' is bent to the pos.ition shown in Figure 2~ The blank 12 is thus formed into the final shape of body 1 right aEter the passage 4 and the valve bore 6 are formed.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. Die forged housing for a shutoff or non-return valve with two fullbore ports connected with a conduit, said ports having cylindrical end portions; said conduit having end orifices located on the axis of the conduit and being separated by a valve disc movable perpendicular to a longitudinal axis of the housing, said ports having respective first and second central axes coin-ciding with extensions of the axis of said conduit; said ports having bores of circular cross-section leading to entrance and exit ends of the valve, said valve disc being movable in a spindle bore connected to the bores of said ports, said spindle bore having an axis perpendicular to the axes of the bores of said ports, one of said port bores being curved with said first central axis having a first portion extending into the axis of said conduit, said first central axis having a second portion inclined to said first portion and communicating with said spindle bore, the second central axis of the other one of said ports being straight-lined and coinciding with extensions of the axis of said conduit.

2. A housing as defined in claim 1 wherein said ports are welded to said conduit, said ports being free of threaded portions.

3. A housing as defined in claim 1 wherein said ports have walls of uniform thickness, and said walls are free of threaded portions.

4. A housing as defined in claim 1 wherein said ports have end openings lying in planes perpendicular to the axis of said conduit, said end openings being parallel to planes of said end orifices of said conduit.

5. A housing as defined in claim 1 wherein said ports are welded to said conduit and are free of threaded portions, said ports having walls of uniform thickness, said ports having end openings lying in planes perpendicular to the axis of said conduit, the planes of said end openings being parallel to planes of said end orifices of said conduit.